One of the groups attending is the "International Socialist Organization" whose website says:

"The ISO stands in the tradition of revolutionary socialists Karl Marx, V.I. Lenin and Leon Trotsky in the belief that workers themselves--the vast majority of the population--are the only force that can lead the fight to win a socialist society."

It has a branch in Madison, and the ISO's overall goals are:

..."helping to build a number of struggles: the movement to stop war and occupation, fights against racism and anti-immigrant scapegoating, the struggle for women's rights like the right to choose abortion, opposing anti-gay bigotry, and standing up for workers' rights."